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#461050 - 10/29/12 1:11 am Mainshaft  
Joined: Jan 2006
Posts: 1,835
Mike Baker Offline
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Mike Baker  Offline
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Joined: Jan 2006
Posts: 1,835
Asheville, NC
65 TR6
I put together the best gearbox that I could from the bins of parts the owner gave me. I now suspect that at some point the factory changed thread count on the clutch end (and possibly the opposite end) of the mainshaft. Can anyone confirm?
Thanks, Mike

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#461063 - 10/29/12 2:30 am Re: Mainshaft [Re: Mike Baker]  
Joined: May 2009
Posts: 606
BikeVice Offline
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BikeVice  Offline
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Joined: May 2009
Posts: 606
San Rafael, Ca.

Yes, Triumph changed both the mainshaft threads from CEI to UNF for the 1968 model year.

ERic


1971 T120RV (R.I.P.)
1973 T140V/TR7
1993 Ducati 900 SS
#461066 - 10/29/12 2:39 am Re: Mainshaft [Re: Mike Baker]  
Joined: Jul 2009
Posts: 3,549
Pete R - R.I.P. Offline
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Pete R - R.I.P.  Offline
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Joined: Jul 2009
Posts: 3,549
Vic. Australia
The thread at the clutch could be 9/16" x 20 tpi BSC,or 9/16" x 18 tpi UNF.

#461090 - 10/29/12 10:23 am Re: Mainshaft [Re: Mike Baker]  
Joined: Jan 2006
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Mike Baker Offline
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Mike Baker  Offline
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Joined: Jan 2006
Posts: 1,835
Asheville, NC
Thanks.

#461093 - 10/29/12 11:07 am Re: Mainshaft [Re: Mike Baker]  
Joined: May 2006
Posts: 509
76degree-triumph Offline
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76degree-triumph  Offline
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Joined: May 2006
Posts: 509
melbourne, australia
Hey Pete, were you at Broadford on the weekend? I broke the 5 speed and the box in practice on Sat and spent all day making a new one. Late Sat I discovered 5 speed mainshafts have a different thread next to the taper, you know the one that holds the clutch on. The one that you dont know is different until you need to replace it at a race meeting and the blokes you race with are out there doing laps.

Treasured memories.

Sunday-dont go there.


1950 Speed Twin outfit
1951 Thunderbird outfit (76 degree racebike, or is it 90 deg now?)
1955 BSA D3 minibike outfit
Triumph solo's

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